I would disagree with that, both on sonic and technical grounds.
Unless you can find credible measurements of either device that show a before/after improvement (beyond what which would normally be expected in run-to-run measurements) at the analog output of the DAC being fed, I would pass on them.
Failing (or better yet, follow) that, a proper blind comparison with/without them in the system would be something I’d insist on before spending my money on such things.
Now, I’ve not had my hands on the Innuos unit specifically, but I have tried other units with none of them providing any audible change. Further thoughts on such things can be found in this thread. And when I tried the EtherRegen I heard no difference in my system at all in either blind or sighted comparisons.